On average, listings lease in the $20's per square foot per year. The Oak Grove region is experiencing a an increase in rates. In the last 3 months, the median rate increased $9 per sqft per year. That's a 56% rise in rent.
Compared to the rest of the Washington D.C. market, the Oak Grove submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 10 listings have been listed, which means spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 10% of the available leases in the Oak Grove are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,392 sqft. Most buildings in this market are around 2 stories. Most buildings in this market were built in 1989 and are Class B.